The above poster wrote:
"Sorry , but this solicits a "HO-HUM" from me."
Well, sorry buddy, but it was not meant to give you a woody :)
The intention is to inform those that may be interested in what may be the case here.
Knowing these things can make a difference in someone staying 922r legal if/when an owner of one of these weapons decides to switch out some components.
Example:
Someone owning a standard SA M-7 or SA M-7S (both with muzzle brake), may decide to change out the US made polymer stock set for a foreign made one, but leave the US made pistol grip. This means three US made pieces will be removed (buttstock, upper handguard, lower handguard). Since 922r considers the upper and lower handguards as one piece, the addition of the three foreign stock pieces will count as two foreign components (by 922r standards). If the trigger is Bulgarian made (and you did not know it), then what you leave American made to count towards your 922r count, is the receiver, hammer, disconnector, and pistol grip. These will add up to four US made components, which will be one shy of being legal by 922r regulations. You need a total of five US made components to meet 922r with the muzzle braked milled receiver SA M-7 rifle.
As the example senerio shows, the person may end up leaving one too many foreign made components (in this case the trigger), and simply because he believed the trigger was US made. I know they would have to show that you intended to break 922r regulations, but by you knowing all the facts, you don't have to unintentionally break the law :)
So ho hum to you..........but to someone that was planning a component swap on their SA M-7, this may indeed be important info :)